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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Characteristics of auto-ignition in gasoline–biodiesel blended fuel under engine-like conditions
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Characteristics of auto-ignition in gasoline–biodiesel blended fuel under engine-like conditions

机译：在发动机状条件下汽油 - 生物柴油混合燃料中自动点火的特性

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摘要

The purpose of this study is to demonstrate the effects of biodiesel fraction on auto-ignition for gasoline–biodiesel blended fuel, which combines two fuels with widely different auto-ignition characteristics. First, gasoline was blended with biodiesel at 5%, 10%, 15%, and 20% by volume, and then tested in a rapid compression expansion machine at a compression ratio of 11 and a temperature range of 720–850?K to observe the auto-ignition delay phenomenon under engine-like conditions. The experimental conditions are focused on improving the auto-ignition characteristic of gasoline direct-injection compression ignition combustion strategies under low load and cold start. The heat release rate of the blended fuels was calculated from the pressure trace and displacement history of the piston in order to identify first-stage ignition and second-stage (auto-ignition) ignition delay. Second, a gasoline–biodiesel reaction mechanism was developed to predict the chemical ignition delay of the blended fuels. The reaction mechanism with 4285 species and 15,246 reactions was validated and implemented using the CHEMKIN PRO software. Finally, the chemical ignition delay was predicted by the simulation which was further compared to the experimental measured results. These results revealed that a higher biodiesel fraction helps to obtain shorter ignition delay, which reduces the requirement of intake temperature. The blended fuel with 20% biodiesel showed the lowest ambient temperature at the injection timing requirement and was 80?K lower than gasoline. Each blended fuel exhibited two-stage ignitions in the measured temperature range. The combustion duration and pressure peak of every blended fuel were similar to each other after increasing the biodiesel fraction.
机译：本研究的目的是展示生物柴油分数对汽油 - 生物柴油混合燃料的自动点火的影响，该燃料结合了两种具有广泛不同的自动点火特性的燃料。首先，将汽油以5％，10％，15％和20％体积的生物柴油混合，然后以110-850Ω·k的压缩比在快速压缩膨胀机中进行测试，以观察到720-850Ω·k的温度范围在发动机状条件下自动点火延迟现象。实验条件集中于改善低负荷和冷启动下汽油直喷压燃烧燃烧策略的自燃特性。从活塞的压力迹线和位移历史计算混合燃料的热释放速率，以识别第一级点火和第二阶段（自动点火）点火延迟。其次，开发了汽油 - 生物柴油反应机理以预测混合燃料的化学点火延迟。使用Chemkin Pro软件验证和实施具有4285种和15,246个反应的反应机理。最后，通过模拟预测化学点火延迟，该模拟进一步与实验测量结果相比。这些结果表明，更高的生物柴油馏分有助于获得更短的点火延迟，这降低了进气温度的要求。具有20％生物柴油的混合燃料显示出注射正时要求的最低环境温度，并且比汽油低80？K。每个混合燃料在测量的温度范围内表现出两级点火。在增加生物柴油级分之后，每个混合燃料的燃烧持续时间和压力峰值相似。

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